Bottle cap and a bottle with the same

ABSTRACT

Disclosed is a bottle cap  100  that is detachably assembled with an adjacent portion  2  of an opening of a bottle  1 , and the bottle with the same. The bottle cap  100  is comprised of a circumferential portion  10  that is shaped to wrap up an outer surface of the adjacent portion  2  of the opening therein; a cap portion  20  that closes an upper side of the circumferential portion  10 ; a plurality of tamper indication portions  30  respectively extended from a central area of the circumferential portion  10  to a lower end thereof; a bending portion  40  that connects upper ends of the respective tamper indication portions  30  in a line; an opening piece portion  50  comprised of the plurality of tamper indication portions  30  and the bending portion  40 ; and a recess portion  70  so formed on an inner surface of the circumferential portion  10  as to prevent separation. Accordingly, it is possible to open and close the bottle cap merely with a simple operation with a single hand, to secure the area for the advertisement or the like sufficiently, to reduce the manufacturing costs by reducing the height of the bottle cap, and to increase the productivity by simplifying the manufacturing process.

FIELD OF THE INVENTION

The present invention relates to a bottle cap, and more particularly, toa bottle cap that has tamper indication means and can be opened with asimple operation by one hand and a bottle with the same.

BACKGROUND OF THE INVENTION

The product containing beverage or the like to be sold generally has atamper indication means for providing the means for confirming the firstopening thereof. The tamper indication means is a means for providingconfidence that the bottle containing the beverage, drug or the like isprovided to the consumer without any prior experience of opening, whichis required to have the construction that cannot be opened without thetrace of opening such as the cutting of the tamper indication means.

There are several prior arts concerning the tamper indication means suchas U.S. Pat. No. 5,074,425 and No. 3,673,761 (Leitz/CIBA-Geigy AG),Germanic Patent No. OS-14 82 603 (Teillac/ALCA S.A.), etc.

FIGS. 15 and 16 show a general conventional construction of the bottlecap having the tamper indication means.

As shown in the drawings, the conventional bottle cap 200 is comprisedof a circumferential portion 210 that is shaped to wrap up the outersurface of the opening of a bottle and has a spiral structure (notshown) on the inner surface thereof, a cap portion 220 formed to closethe upper side of the circumferential portion 210, and a tamperindication means 230.

Here, the tamper indication means 230 is comprised of a band 231 that isso formed around the lower end of the circumferential portion 210 as towrap up the outer surface of the opening of the bottle, and a pluralityof connection bridges 232 that connect the band 231 and thecircumferential portion 210 with each other. When the bottle cap 200 isfirst opened, the circumferential portion 210 and the band 231 areseparated from each other by cutting.

Further, in order to separate the band 231 from the bottle after theconnection bridges 231 are cut off by the first opening of the bottlecap 200, there would be equipped a cut-off portion 240 that is cut offat a certain position on the band 231 and a connection part 240 thatconnects the band 231 with the lower end of the circumferential portion210 of the bottle cap 200.

The tamper indication means 230 is required only when the bottle cap 200is first opened. Therefore, as shown in FIG. 16, the bottle cap 200 isseparated from the bottle while the band 231 is hung on the bottle cap200, and the band 231 is then removed clearly as the connection part 250is wholly cut off by twisting it or any other manipulation. Then, theoperation to assemble the bottle cap 200 with the bottle after the firstopening and the operation to re-open the bottle cap 200 when the bottlecap 200 is to be re-opened are not hindered by the tamper indicationmeans 230.

Many of conventional arts about the bottle cap with the tamperindication means have been known publicly, however, all of them have theconstruction that the first opening of the bottle cap and the cuttingoff of the connection bridge are executed in a single operation in atwisting manner as above. Therefore, in order to help the twist of thebottle cap 200, a wrinkled portion for increasing the frictional forcewith respect to the fingers is generally formed on the outer surface ofthe circumferential portion 210 of the bottle cap 200.

However, such a conventional bottle cap 200 that has the construction tobe opened by the twist has the following problems.

First, after the bottle cap 200 is first opened, the piece of the tamperindication means 230 such as the band 231 will remain on the openingportion of the bottle or a certain area of the bottle cap 200, which isnot helpful to the closing or the re-opening of the bottle cap 200 butis an obstacle to such operations, so there needed an additionaloperation to remove it.

Second, it is preferable that the cap portion 220 and thecircumferential portion 210 of the bottle cap 220 include a certainamount of area to display the trademark about the content in the bottleor the advertisement, however, such an area cannot be secured in theconventional construction as the wrinkled portion for increasing thefriction with respect to the finger has to be formed on thecircumferential portion of the bottle cap 200.

Third, since a screw structure for opening and closing by twist has tobe formed on the outer surface of the opening of the bottle and theinner surface of the bottle cap 200, the height of the bottle cap 200has to be greater than a certain size.

Four, as a process to equip the bottle cap 200 onto the opening of thebottle by the twist thereof is required in the manufacturing process ofthe product that contains the content, it is hard to simplify themanufacturing process.

DETAILED DESCRIPTION OF THE INVENTION Technical Problem

The present invention has been proposed to overcome the above problems,and it is the first object of the present invention to provide a bottlecap and a bottle with the same that it is possible to open and close thebottle cap merely with a simple operation with a single hand.

It is the second object of the present invention to provide a bottle capand a bottle with the same that the area for the advertisement or thelike can be secured sufficiently.

It is the third object of the present invention to provide a bottle capand a bottle with the same that it is possible to reduce themanufacturing costs by reducing the height of the bottle cap, and toincrease the productivity by simplifying the manufacturing process byremoving the conventional screwing process.

Technical Solution

To achieve the above-described objects, the present invention provides abottle cap that is detachably assembled with an adjacent portion of anopening of a bottle, the bottle cap comprising: a circumferentialportion that is shaped to wrap up an outer surface of the adjacentportion of the opening therein; a cap portion that closes an upper sideof the circumferential portion; a plurality of tamper indicationportions respectively extended from a central area of thecircumferential portion to a lower end thereof; a bending portion thatconnects upper ends of the respective tamper indication portions in aline; an opening piece portion comprised of the plurality of tamperindication portions and the bending portion; and a recess portion soformed on an inner surface of the circumferential portion as to preventseparation.

It is preferable that two tamper indication portions spaced from eachother are formed.

It is preferable that said two tamper indication portions are so formedthat a distance between lower portions thereof are greater than thedistance between upper portions thereof.

It is preferable that each of the tamper indication portions includes:cutting line recesses formed by partially cutting away thecircumferential portion; and a plurality of connection bridges thatconnect the cutting recesses so as to be cut off as the bottle cap isopened.

It is preferable that an opening knob protruding outward of an outersurface of the opening piece portion is additionally equipped.

It is preferable that a supporting protrusion is additionally equipped,which is so formed above the opening piece portion on the outer surfaceof the circumferential portion as to be contacted with the opening knobof the opening piece portion while the opening piece portion is movedupward by a cutting of the connection bridges.

It is preferable that a friction generating means provided on an outersurface of the opening knob and the supporting protrusion isadditionally equipped.

The friction generating means can be a knurling, and more particularly,a wrinkled portion formed horizontally.

The circumferential portion is preferably formed by an elastic materialso that an area of the opening at a lower end thereof can be changed.

It is preferable that the circumferential portion is so formed that athickness of the upper portion thereof is greater than the thickness ofthe lower portion thereof.

It is preferable that a closing knob protruding upward at a central areafrom the upper side of the cap portion is additionally equipped.

It is preferable that a recess portion for increasing an elastic forceformed on an inner side of the closing knob is additionally equipped.

The recess portion for preventing separation is preferably formed to aring shape along the inner surface of the circumferential portion.

It is preferable that plural recess portions are formed on upper andlower areas of the inner surface of the circumferential portion.

Meanwhile, it is preferable to further comprise a cut-away portionformed on a side opposite to the opening piece portion on thecircumferential portion, the cut-away portion being formed by cuttingaway a lower end area of the circumferential portion at a certain size.

Furthermore, a plurality of opening piece portions can be formedrespectively on positions different from each other on thecircumferential portion.

Meanwhile, according to another aspect of the present invention, thepresent invention provides a bottle cap that is detachably assembledwith an adjacent portion of an opening of a bottle, the bottle capcomprising: a circumferential portion that is shaped to wrap up an outersurface of the adjacent portion of the opening therein, thecircumferential portion being formed to have a cross section oftrapezoidal shape so that a lower portion of the inner surface thereofis wider than an upper portion thereof, and being formed by an elasticmaterial so that an area of an opening at a lower end thereof can bechanged; a cap portion having a closing knob protruding upward at acentral area of an upper side thereof, the cap portion for closing anupper side of the circumferential portion; two tamper indicationportions respectively having cutting recesses formed by partiallycutting away the circumferential portion, and connection bridges thatconnect the cutting recesses so as to be cut off as the bottle cap isopened, the tamper indication portions respectively extended from acentral area of the circumferential portion to a lower end thereof andbeing so formed that a distance between lower portions thereof aregreater than the distance between upper portions thereof; a bendingportion that connects upper ends of the respective tamper indicationportions in a line; an opening piece portion comprised of said twotamper indication portions and the bending portion, the opening pieceportion having opening knob protruding outward of an outer surfacethere; a supporting protrusion that is formed above the opening pieceportion on the outer surface of the circumferential portion so as to becontacted with the opening knob of the opening piece portion while theopening piece portion is moved upward by a cutting of the connectionbridges; a wrinkled portion formed horizontally on an outer surface ofthe opening knob and the supporting protrusion; a recess portion formedto a ring shape along an inner surface of the circumferential portion,the recess portion for preventing separation; a closing knob protrudingupward at a central area from the upper side of the cap portion; andanother recess portion formed on an inner side of the closing knob, therecess portion for increasing an elastic force.

According to still another aspect of the present invention, the presentinvention provides a bottle on which the bottle cap is detachablyassembled with an adjacent portion of an opening thereof, wherein theadjacent portion of the opening has a cross section of trapezoidal shapeso that a lower end of an outer surface thereof is wider than an upperend thereof, and a protrusion for prevent separation that is inserted toa recess for preventing separation formed on an inner surface of thecircumferential portion of the bottle cap is formed on an outer surfaceof the adjacent portion of the opening.

BREIF DESCRIPTION OF THE DRAWINGS

FIGS. 1 through 12 show the embodiments of the bottle cap according tothe present invention, in which

FIG. 1 is a perspective view of the first embodiment,

FIG. 2 is an operational view of the first embodiment,

FIG. 3 is a perspective view of the second embodiment,

FIG. 4 is a front view of the second embodiment,

FIG. 5 is a partially cut-away view of the second embodiment,

FIG. 6 is an operational view of the second embodiment,

FIG. 7 is a sectional view of the third embodiment,

FIG. 8 is a perspective view of the opening of the bottle of the presentinvention,

FIG. 9 is a sectional view showing the state that the bottle cap of thethird embodiment of the present invention is assembled with the bottle,

FIG. 10 is a sectional view showing the state that the bottle cap of thefourth embodiment is assembled with the bottle,

FIG. 11 is a sectional view showing the process that the power appliedto the bottle cap of the fourth embodiment is transmitted,

FIG. 12 is a bottom view of the bottle cap,

FIGS. 13 and 14 show another embodiment of the present invention, and

FIGS. 15 and 16 are views showing the construction of the conventionalbottle cap.

PREFERRED EMBODIMENT OF THE INVENTION

Hereinbelow, the preferable embodiments of the present invention will bedescribed in greater detail with reference to the accompanying drawings.

FIGS. 1 through 12 show the example of the bottle cap according to thepresent invention, in which FIG. 1 is a perspective view of the firstembodiment, FIG. 2 is an operational view of the first embodiment, FIG.3 is a perspective view of the second embodiment, FIG. 4 is a front viewof the second embodiment, FIG. 5 is a partially cut-away view of thesecond embodiment, FIG. 6 is an operational view of the secondembodiment, FIG. 7 is a transverse sectional view of the thirdembodiment, FIG. 8 is a perspective view of the opening of the bottle ofthe present invention, FIG. 9 is a transverse sectional view showing thestate that the bottle cap of the third embodiment of the presentinvention is assembled with the bottle, FIG. 10 is a transversesectional view showing the state that the bottle cap of the fourthembodiment is assembled with the bottle, FIG. 11 is a transversesectional view showing the process that the power applied to the bottlecap of the fourth embodiment is transmitted, FIG. 12 is a bottom view ofthe bottle cap, and FIGS. 13 and 14 show another embodiment of thepresent invention.

As shown in FIGS. 1, 2 and 7, the bottle cap 100 according to thepresent invention basically has the construction that it is assembledwith the adjacent portion 2 of the opening of the bottle 1, which iscomprised of a circumferential portion 10 that is shaped to wrap up anouter surface of the adjacent portion 2 of the opening therein; a capportion 20 that closes an upper side of the circumferential portion 10;a plurality of tamper indication portions 30 respectively extended froma central area of the circumferential portion 10 to a lower end thereof;a bending portion 40 that connects upper ends of the respective tamperindication portions 30 in a line; an opening piece portion 50 comprisedof the plurality of tamper indication portions 30 and the bendingportion 40; and a recess portion 70 so formed on an inner surface of thecircumferential portion 10 as to prevent separation.

Further, as shown in FIG. 8, the bottle 1 with which the bottle cap 100of the above construction is assembled has the construction that theadjacent portion 2 of the opening has a cross section of trapezoidalshape so that the lower end of an outer surface thereof is wider thanthe upper end thereof, and a protrusion 80 for prevent separation thatis inserted to a recess 70 for preventing separation formed on an innersurface of the circumferential portion 10 of the bottle cap 100 isformed on an outer surface of the adjacent portion 2 of the opening.

In other words, a plurality of tamper indication portions 30 arerespectively extended from a central area of the circumferential portion10 to a lower end thereof, the bending portion 40 is formed at the upperend area of the tamper indication portions 30, and the opening pieceportion 50 is formed by them. Therefore, the user can cut the tamperindication portion 30 (shown in FIGS. 6 a and 6 b) by moving the lowerend of the opening piece portion 50 upward and downward around thebending portion 40 with his/her thumb while he/she is grasping the lowerpart of the bottle cap 100 on the bottle 1, and then separate the bottlecap 100 from the opening of the bottle 1 (shown in FIGS. 6 c and 6 d),so there is provided the construction that the bottle cap can be openedin a simple operation with one hand even though the tamper indicationportion exists.

Further, the recess portion 70 for preventing separation is formed onthe inner surface of the circumferential portion 10 of the bottle cap100, a protrusion 80 for prevent separation is so formed to be insertedinto the recess 70 for preventing separation on the outer surface of theadjacent portion 2 of the opening of the bottle 1, and the adjacentportion 2 of the opening of the bottle 1 has the cross section oftrapezoidal shape so that the lower end thereof is wider than the upperend thereof.

Therefore, when the bottle cap 100 is pushed downward onto the bottle 1from the upper side of the bottle 1, it is easy to assemble the bottlecap 100 with the bottle 1 without any trouble since the lower opening ofthe bottle cap 100 is wider than the upper opening of the bottle 1.

However, once the bottle 1 is closed by the bottle cap 100, the bottlecap 100 has to be pulled from the bottle 1 while the circumferentialportion 10 of the bottle cap 100 is pushed by the hand. Such anoperation inevitably causes the pressing between the recess portion 70for preventing separation on the inner surface of the bottle cap 100 andthe protrusion 80 for preventing separation on the outer surface of thebottle 1. Accordingly, the bottle cap 100 cannot be opened without thecutting of the tamper indication portion 30, and consequently, thebottle 1 is endowed with the confidence about the first opening.

Moreover, in order to guarantee the effect of preventing separation ofthe bottle cap 100 from the bottle 1, it is preferable that the recessportion 70 for preventing separation is formed to a ring shape along theinner surface of the circumferential portion 10, and it is morepreferable that plural recess portions 70 are formed on upper and lowerareas of the inner surface of the circumferential portion 10.

The present invention does not employ the opening method of twistingmanner described above, so it is possible to secure the area for theadvertisement or the like as the additional friction structure is notrequired on the circumferential portion 10 of the bottle cap 100, it ispossible to reduce the height of the entire bottle cap 100 to reduce thecosts as an additional screw structure or the like is not required onthe inner surface of the circumferential portion 10 of the bottle cap100, and it is also possible to increase the productivity as themanufacturing process can be simplified by a simple downward pressprocess without the twist of the bottle cap 100 in equipping the bottlecap 100 onto the bottle 1.

Furthermore, the bottle cap 100 of the present invention has theconstruction that the bottle cap 100 can be opened by applying only asimple upward movement with one hand to the opening piece portion 50,wherein the reduction of the height of the entire bottle cap 100 canprovide a side effect to make such an opening operation easier.

In such a situation, the number of the tamper indication portions 30 isnot limited to a specific number if it is greater than two since theyare formed along the circumferential portion 10 of the bottle cap 100 toform the opening piece portion 50, however, two that are spaced fromeach other are preferable in consideration of the manufacturing costs.

Furthermore, since the present invention has the construction that theopening piece portion 50 formed by cutting off the tamper indicationportions 30 is moved upward, it is profitable that the lower end of theopening piece portion 50 is wide in order to secure the contacting areaof the finger on the opening piece portion 50 and the bending portion 40that is the axis of the upward movement of the opening piece portion 50is narrow in order to secure the smooth bending. Therefore, it isprofitable that the upper end of the opening piece portion 50 that formsthe bending portion 40 is narrow.

Accordingly, in order to form the above construction of the openingpiece portion 50, it is preferable that the interval between the lowerends of two tamper indication portions 30 constituting the opening pieceportion 50 is wider than that of the upper ends thereof.

The tamper indication portions 30 is used for confirming whether thebottle cap has ever been opened or not, and in FIGS. 1 and 2, it iscomprised of tamper indication recesses 31 formed by partially cuttingaway the circumferential portion 10; and a plurality of connectionbridges 32 that connect the tamper indication recesses 31 so as to becut off as the bottle cap 100 is opened, however, that is merely ageneral example and it is not limited to any type of construction if theopening piece portion 50 can be formed by cutting two tamper indicationportions 30.

FIGS. 3 through 6 show the second embodiment of the present invention.

As shown in the figures, an opening knob 51 protruding outward of theouter side of the opening piece portion 50 is additionally provided.

Such a construction is aimed, when the user operates the opening pieceportion 50 to move upward while one of his/her fingers is in contactwith the lower end of the opening piece portion 50 in order to firstopen the bottle cap 100 of the present invention, to enlarge thecontacting area between the finger and the opening piece portion 50 forthe convenience of opening operation.

Further, the bottle cap 100 is perfectly opened by moving the openingpiece portion 50 continuously around the axis of bending portion 40after cutting off the tamper indication portions 30, and in such asituation, in order to transmit the upward force of the opening pieceportion 50 to the overall bottle cap 100 more effectively, it ispreferable that a supporting protrusion 60 is additionally providedwhich is so formed above the opening piece portion 50 on the outersurface of the circumferential portion 10 as to be contacted with theopening knob 51 of the opening piece portion 50 while the opening pieceportion 50 is moved upward by the cutting of the connection bridges 32.

Further, in order to enhance the efficiency to transmit the power duringthe opening operation, it is required to prevent the sliding between thefingers and the opening knob 51 and between the opening knob 51 and thesupporting protrusion 60, so it is preferable that a means forgenerating friction is additionally employed on the outer surface of theopening knob 51 and the supporting protrusion 60.

In this situation, the friction generating means can be realized by aknurling for generating the frictional force on the finger when theopening knob 51 is pushed by the finger, and any kinds of frictiongenerating methods such as to make the surface rough, to formprotrusions, or the like can be employed. However, the presentembodiment exemplifies the wrinkled portion formed horizontally as anexample of the knurling.

FIG. 6 shows the operation of the present embodiment.

The opening mechanism of the bottle cap 100 according to the presentinvention is illustrated with reference to the drawing.

When the user moves the opening knob 51 of the opening piece portion 50upward while the end of his/her thumb is in contact with the openingknob 51 (FIG. 6 a), the tamper indication portions 30 are cut off (FIG.6 b), and then the opening knob 51 is contacted with the supportingprotrusion 60, by which the bottom side of the thumb is naturallycontacted with the cut-off side of the opening knob 51 (FIG. 6 c). Theupward force by the thumb generates the twisting moment on the entirebottle cap 100 according to the above construction (FIG. 6 d), wherebythe power can be transmitted more effectively.

Next, the closing mechanism of the bottle cap 100 according to thepresent invention is illustrated.

FIGS. 7 through 12 illustrate such an operation.

The bottle cap 100 of the present invention is opened and closed not bythe twisting manner but only by the upward force of one finger, so theclosing operation is also performed by such a manner as to push down thebottle cap 100 from the right above of the opening of the bottle 1.

For the stable assembly of the bottle cap 100, a protrusion 80 forpreventing separation that is inserted to a recess 70 for preventingseparation formed on an inner surface of the circumferential portion 10of the bottle cap 100 is formed on an outer surface of the adjacentportion 2 of the opening of the bottle, the circumferential portion 10is formed by an elastic material so that the area of the opening at thelower end thereof can be changed, and the adjacent portion 2 of thebottle is so formed to have the cross section of trapezoidal shape thatthe lower end of the outer surface thereof is wider than the upper endthereof.

Accordingly, as the bottle cap 100 is pushed to be assembled, the innersurface of the circumferential portion 10 of the bottle cap 100 that ismade of elastic material presses the outer surface of the adjacentportion 2 of the opening of the bottle 1 so as to strengthen theassembly between the protrusion 80 for preventing separation and therecess 70 for preventing separation, whereby the separation of thebottle cap 100 is prevented and the stable assembly can be achieved.

The circumferential portion 10 of the bottle cap 100 can be constitutedto have the cross section of rectangular shape or trapezoidal shape, andif the bottle 1 of trapezoidal cross section is employed, the lower endof the circumferential portion 10 is expanded elastically to result inthe trapezoidal shape of bottle cap 100 after being assembled with thebottle 1.

Accordingly, in order to have the rectangular shape after the bottle cap100 is assembled with the bottle 1, as shown in FIG. 9, it is preferablethat the thickness of the upper part of the circumferential portion 10of the bottle cap 100 is greater than the lower part thereof.

When such a construction is employed, the thickness of the tamperindication portions 30 becomes thin at the lower area of thecircumferential portion 10 of the bottle cap 100 and the thicknessthereof becomes relatively thick at the upper area thereof, by which anadditional effect is achieved that the tamper indication portions 30 canbe cut off more easily.

Further, in such a construction, in order to transmit the downward forceapplied to the cap portion 20 of the bottle cap 100 to thecircumferential portion 10 of the bottle cap 100 effectively, it ispreferable that a closing knob 21 protruding upward at a central areafrom the upper side of the cap portion 20 is additionally provided.

In such a situation, it is preferable that a recess portion 22 forincreasing elastic force is formed on the inner side of the closing knob21.

As shown in FIG. 11, according to such a construction, the lower end ofthe circumferential portion 10 is easily opened elastically when theclosing of the bottle cap 100 is started (designated by solid arrow),and the inner surface of the circumferential portion 100 of the bottlecap 100 is naturally pressed elastically onto the outer surface of thebottle 1 by the rising up of the closing knob 21 after the closing ofthe bottle cap 100 is finished (designated by dotted arrow).

Meanwhile, FIGS. 13 and 14 show another embodiment of the presentinvention, which are the drawings similar to the above FIGS. 6 a and 6d, respectively.

In the present embodiment, a cut-away portion 61 is formed on thecircumferential portion 10. The cut-away portion 61 is preferably formedon the side opposite to the opening knob 50 on the circumferentialportion 10, and is formed by cutting away the lower end area of thecircumferential portion 10 at certain size and shape. As such a cut-awayportion 61 is formed, when the opening knob 51 is pushed by finger asshown in FIG. 13 to open the bottle cap 100, the bottle cap 100 pivotsabout the upper edge of the cut-away portion 61 as shown in FIG. 14.Accordingly, in comparison with the case that the cut-away portion 61does not exist, the pivoting axis of the bottle cap 100 is located atthe higher position on the circumferential portion 10 to make it easy topivot the bottle cap 100, and therefore, it is easier to open the bottlecap 100.

Meanwhile, the present embodiment shows the example that only a singleopening piece portion 50 is formed, however, as a modification of thepresent embodiment, a plurality of opening piece portions 50 can beformed on positions different from each other on the circumferentialportion 10. In such a situation, the arrangement of the opening pieceportions 50 can be modified to a variety of manners such as to form onthe opposite sides on the circumferential portion 10, or to form threeor more opening piece portions 50 in a radial manner.

INDUSTRIAL APPLICABILITY

According to the bottle cap and the bottle with the same of the presentinvention, it is possible to open and close the bottle cap merely with asimple operation with a single hand, to secure the area for theadvertisement or the like sufficiently, to reduce the manufacturingcosts by reducing the height of the bottle cap, and to increase theproductivity by simplifying the manufacturing process.

The preferred embodiments have been illustrated and described so far,however, it will be understood by those skilled in the art that variouschanges and modifications can be made within the spirit and the scope ofthe present invention, and accordingly, the scope of the presentinvention is not limited within the described range but the followingclaims and the equivalents thereof.

1. A bottle cap that is detachably assembled with an adjacent portion ofan opening of a bottle, the bottle cap comprising: a circumferentialportion that is shaped to wrap up an outer surface of the adjacentportion of the opening therein; a cap portion that closes an upper sideof the circumferential portion; a plurality of tamper indicationportions respectively extended from a central area of thecircumferential portion to a lower end thereof; a bending portion thatconnects upper ends of the respective tamper indication portions in aline; an opening piece portion comprised of the plurality of tamperindication portions and the bending portion; and a recess portion soformed on an inner surface of the circumferential portion as to preventseparation.
 2. The bottle cap according to claim 1, wherein two tamperindication portions spaced from each other are formed.
 3. The bottle capaccording to claim 2, wherein said two tamper indication portions are soformed that a distance between lower portions thereof are greater thanthe distance between upper portions thereof.
 4. The bottle cap accordingto claim 3, wherein each of the tamper indication portions includes:tamper indication recesses formed by partially cutting away thecircumferential portion; and a plurality of connection bridges thatconnect the tamper indication recesses so as to be cut off as the bottlecap is opened.
 5. The bottle cap according to claim 1, furthercomprising an opening knob protruding outward of an outer surface of theopening piece portion.
 6. The bottle cap according to claim 5, furthercomprising a supporting protrusion that is so formed above the openingpiece portion on the outer surface of the circumferential portion as tobe contacted with the opening knob of the opening piece portion whilethe opening piece portion is moved upward by a cutting of the connectionbridges.
 7. The bottle cap according to claim 5, further comprising afriction generating means provided on an outer surface of the openingknob.
 8. The bottle cap according to claim 7, wherein the frictiongenerating means is a knurling.
 9. The bottle cap according to claim 8,wherein the knurling is a wrinkled portion formed horizontally.
 10. Thebottle cap according to claim 1, wherein the circumferential portion isformed by an elastic material so that an area of the opening at a lowerend thereof can be changed.
 11. The bottle cap according to claim 10,wherein the circumferential portion is so formed that a thickness of theupper portion thereof is greater than the thickness of the lower portionthereof.
 12. The bottle cap according to claim 10, further comprising aclosing knob protruding upward at a central area from the upper side ofthe cap portion.
 13. The bottle cap according to claim 12, furthercomprising a recess portion formed on an inner side of the closing knob,the recess portion for increasing elastic force.
 14. The bottle capaccording to claim 1, the recess portion for preventing separation isformed to a ring shape along the inner surface of the circumferentialportion.
 15. The bottle cap according to claim 14, wherein a pluralityof said recess portions are formed on upper and lower areas of the innersurface of the circumferential portion.
 16. The bottle cap according toclaim 1, further comprising a cut-away portion formed on a side oppositeto the opening piece portion on the circumferential portion, thecut-away portion being formed by cutting away a lower end area of thecircumferential portion at a certain size.
 17. The bottle cap accordingto claim 1, wherein a plurality of opening piece portions is formedrespectively on positions different from each other on thecircumferential portion.
 18. A bottle cap that is detachably assembledwith an adjacent portion of an opening of a bottle, the bottle capcomprising: a circumferential portion that is shaped to wrap up an outersurface of the adjacent portion of the opening therein, thecircumferential portion being formed to have a cross section oftrapezoidal shape so that a lower portion of the inner surface thereofis wider than an upper portion thereof, and being formed by an elasticmaterial so that an area of an opening at a lower end thereof can bechanged; a cap portion having a closing knob protruding upward at acentral area of an upper side thereof, the cap portion for closing anupper side of the circumferential portion; two tamper indicationportions respectively having tamper indication recesses formed bypartially cutting away the circumferential portion, and connectionbridges that connect the tamper indication recesses so as to be cut offas the bottle cap is opened, the tamper indication portions respectivelyextended from a central area of the circumferential portion to a lowerend thereof and being so formed that a distance between lower portionsthereof are greater than the distance between upper portions thereof; abending portion that connects upper ends of the respective tamperindication portions in a line; an opening piece portion comprised ofsaid two tamper indication portions and the bending portion, the openingpiece portion having opening knob protruding outward of an outer surfacethere; a supporting protrusion that is formed above the opening pieceportion on the outer surface of the circumferential portion so as to becontacted with the opening knob of the opening piece portion while theopening piece portion is moved upward by a cutting of the connectionbridges; a knurling portion formed on an outer surface of the openingknob and the supporting protrusion; a recess portion formed to a ringshape along an inner surface of the circumferential portion, the recessportion for preventing separation; a closing knob protruding upward at acentral area from the upper side of the cap portion; and another recessportion formed on an inner side of the closing knob, the recess portionfor increasing an elastic force.
 19. A bottle on which the bottle capaccording to claim 1 is detachably assembled with an adjacent portion ofan opening thereof, wherein the adjacent portion of the opening has across section of trapezoidal shape so that a lower end of an outersurface thereof is wider than an upper end thereof, and a protrusion forprevent separation that is inserted to a recess for preventingseparation formed on an inner surface of the circumferential portion ofthe bottle cap is formed on an outer surface of the adjacent portion ofthe opening.